Most cleanroom wiper decisions default to synthetics (polyester, polypropylene) for low-linting behavior and chemical compatibility. But there are “non-default” situations where cotton is selected on purpose: elevated temperature wipe points, diffusion furnace maintenance cleaning, magnetic media disk handling steps, and ESD-sensitive wipe-down tasks where static discharge control is part of the risk model. Texwipe TX309 is built for that niche: a 100% cotton twill wiper with a tight weave and a defined antistatic performance posture, packaged for controlled introduction.

Reliability is part of the control plan. SOSCleanroom supports program stability for Texwipe wipes through consistent sourcing, documentation continuity, and practical application support so teams avoid unqualified substitutions when schedules tighten and maintenance work accelerates.

TX309 is positioned for cleaning and polishing/burnishing magnetic media disks, cleaning diffusion furnace equipment in wafer fabrication and other elevated-temperature areas, and removing aqueous and organic solvent spills. It is also used as a utility wipe when teams want a cotton surface and a defined ESD-control posture rather than a generic shop rag or binder-heavy nonwoven.

TX309 typically earns selection when the wiping risk is dominated by temperature exposure, static discharge control, and robust spill pickup rather than the absolute lowest synthetic wiper background.

• Substrate: 100% cotton twill, bias cut, tight weave (listed as 118 × 60 threads/in²) designed to hold together under real wiping forces.
• High-temperature posture: described as having strong heat tolerance; commonly used in diffusion furnace equipment cleaning contexts.
• ESD-control posture: described as providing dissipative performance in 40–60% RH and resistance to ESD charge buildup, intended to help guard against static discharge during wiping.
• Contamination control feature: a low-linting surface with edges protected by an ULP (Ultra Low Particulate) treatment, intended to reduce particle contribution from edges in use.
• Packaging discipline: solvent-safe bag-within-bag presentation supports controlled introduction and staged use.

Cotton behaves differently than synthetic continuous-filament knits. A tight twill weave can be mechanically stable, highly absorbent, and tolerant of higher temperature exposure, which is why cotton remains a deliberate choice for certain maintenance and equipment-cleaning steps. TX309 is described as bias cut—a practical construction choice that can help reduce fraying behavior compared with straight cuts under repeated folding and directional wipe force.

Keep terminology honest: no wiper is truly lint-free in every process condition. The control target is low-linting performance in your use condition—pressure, stroke direction, surface texture, and reusing a loaded face drive most fiber/particle events.

TX309 is supplied as a 9" × 9" cotton twill wiper with cut edges. Packaging is listed as 300 wipers per bag with 2 inner bags of 150, and 10 bags per case. This configuration supports staged issuance (open one inner pack, keep the remainder protected), which is especially important for cotton wipes to reduce handling-driven contamination and uncontrolled exposure time.

For disciplined placement, TX309’s published typical values provide a starting point across releasables (particles/fibers), residues (NVR), and ionic extractables. Treat typical data as a qualification input—not a substitute for process-window confirmation when yield or audit defense depends on the wipe step.

• Basis weight: 130 g/m² (typical).
• Sorptive capacity: 800 mL/m² (typical) — aligns to “spill pickup” and liquid-hold requirements.
• LPC (≥0.5 µm): 150 × 10⁶ particles/m² (typical).
• Fibers (≥100 µm): 150,000 fibers/m² (typical).
• NVR: 0.04 g/m² (IPA) and 0.04 g/m² (DI water) (typical).
• Ionic extractables (typical, ppm): Na 3, K 1, Cl 1.

Practical translation: TX309 is engineered as a robust cotton wipe with controlled packaging and defined ESD posture, but it will not behave like a sealed-edge polyester knit in edge-driven releasables risk. Technique (directional strokes, face rotation, early discard) is the decisive control lever.

TX309 is positioned with a dissipative performance posture at 40–60% RH intended to reduce static discharge risk during wiping. In ESD-sensitive programs, treat humidity range, grounding strategy, and wipe technique as a system: a “dissipative wipe” is not a substitute for facility ESD controls.

For solvent spill pickup, confirm chemical compatibility against your solvent set and exposure time. For elevated-temperature use, keep handling discipline tight—avoid introducing cotton wipes into steps where loose fibers could be pulled into sensitive interfaces, airflow paths, or precision metrology surfaces.

• Stage the packaging: open only the inner bag needed for the task; reseal and store remaining wipes in controlled storage.
• Fold for control: quarter-fold to create multiple clean faces; treat each face as single-pass for higher-sensitivity wipe-downs.
• Directional strokes: wipe clean-to-dirty with overlapping, single-direction passes to avoid redeposition.
• Swap early: once the wipe face is loaded or near saturation, it becomes a redistribution tool—take a fresh wipe instead of “working it harder.”
• ESD discipline: keep humidity/grounding within your program window; do not treat wipe dissipativity as a standalone control.

• Using cotton as a default final-pass wipe: can elevate releasables risk on defect-sensitive surfaces. Prevent by defining wipe roles (maintenance/high-temp vs. finishing) in the SOP.
• Overworking a saturated wipe: turns absorbency into redeposit. Prevent with face-rotation discipline and early discard triggers.
• Dry wiping textured surfaces under high pressure: increases friction-driven fibers. Prevent by controlling pressure and wetness (when allowed) and using fresh faces.
• Ignoring packaging discipline: open bags on benches invite handling-driven contamination and uncontrolled exposure. Prevent with staged inner-bag use.

The most defensible comparisons are to other cleanroom-grade cotton twill wipes intended for similar “high-absorbency + robust handling” use cases, and to synthetic knit wipes when the constraint shifts to lower releasables on sensitive surfaces.

Valutek cotton twill-patterned cleanroom wipers (9" × 9" class) are a close category peer for cotton wipe programs. Compare packaging discipline, edge strategy, and published contamination context to match your process risk window.

Polyester knit cleanroom wipes (dry) are the typical step sideways when the program becomes limited by edge-driven releasables and residue budgets on highly defect-sensitive surfaces. Use cotton where temperature/absorbency/robustness dominate; use polyester knits where the “what the wipe can add” model is the limiting factor.

TX309 is a deliberate tool for high-temperature maintenance cleaning, robust spill pickup, and ESD-aware wiping where cotton twill behavior is an advantage and packaging discipline keeps handling risk in check. Mature programs treat it as a defined role wiper—not a universal default—paired with synthetic wipes for steps where releasables and residue budgets become the controlling acceptance driver.

• SOSCleanroom product page: “Texwipe TX309 TexWipe 9" × 9" Cotton Cleanroom Wiper” (positioning, feature/benefit statements, application framing). https://www.soscleanroom.com/product/wipers/texwipe-tx309-texwipe-9-x-9-cotton-cleanroom-wiper/
• ITW Texwipe datasheet: “TexWipe® Wipers — TX309 / TX3099” (materials, weave/thread count, ULP treatment statement, ESD/dissipative posture framing, packaging configuration, typical performance metrics). https://www.soscleanroom.com/wp-content/uploads/2024/01/Texwipe_TexWipe_Wipers_TDS.pdf
• Comparator context: Valutek cotton wiper collection/product listing (category peer reference for cotton cleanroom wipers). https://shop.valutek.com/collections/cotton-wiper